How to make commented code to compile?

[Adam D. Ruppe]

On Monday, 9 October 2017 at 14:34:48 UTC, Zhuo Nengwen wrote:
>     //test(cast(ushort) 1, (m, c) => { writeln(m); });

That's a function that returns a function.

Perhaps you meant to just remove the => and be left with a 
multi-line function.